Magnesium alloy polyhedral circulation rolling method

A magnesium alloy and alloy technology, applied in the field of ultra-fine-grain metal material preparation, can solve the problems of reducing the application value of materials, uneven grain distribution, poor material uniformity, etc., and achieves easy industrial production, simple preparation method, and improved yield strength Effect

Inactive Publication Date: 2013-04-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above methods can prepare bulk materials, but they have high requirements for equipment, and the uniformity of the prepared materials is poor. The grain distribution is uneven and most of them belong to the micron-scale range. Value

Method used

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  • Magnesium alloy polyhedral circulation rolling method
  • Magnesium alloy polyhedral circulation rolling method
  • Magnesium alloy polyhedral circulation rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Use wire cutting to cut AZ31 magnesium alloy plate with a square cross section. The plate size is 25mm long and the cross section size is 10mm×10mm, and the coordinates of the alloy are calibrated;

[0031] 2. The alloy is rolled for the first time by using a two-roll rolling mill, and the downforce is 1mm. The temperature of the roll is set at room temperature, and the temperature of the rolled bar is set at 300°C;

[0032] 3. The rolling direction of the previous pass is the axis, and after the sample is rotated 90° clockwise, the alloy is rolled for the second time, with the same amount of pressure, wherein the temperature of the roll is set at room temperature, and the temperature of the rolled bar is Set to 300°C;

[0033] The second step and the third step constitute a rolling cycle, and the number of completed rolling cycles is set to 15 passes, and the rolling process is completed.

[0034] Optical microscopy observations show that there are a large number o...

Embodiment 2

[0036] 1. Use wire cutting to cut AZ31 magnesium alloy plate with a square cross section. The plate size is 30mm long and the cross section size is 12mm×12mm, and the coordinates of the alloy are calibrated;

[0037] 2. The alloy is rolled for the first time with a two-roll rolling mill, and the downforce is about 1.2mm. Among them, the temperature of the roll is set at room temperature, and the temperature of the rolled bar is set at 350°C;

[0038] 3. The rolling direction of the previous pass is the axis, and after the sample is rotated 90° clockwise, the alloy is rolled for the second time, with the same amount of pressure, wherein the temperature of the roll is set at room temperature, and the temperature of the rolled bar is Set to 350°C;

[0039] The second step and the third step constitute a rolling cycle, and the number of completed rolling cycles is set to 18 passes, and the rolling process is completed.

[0040] Optical microscope observations show that there are ...

Embodiment 3

[0042] 1. Use wire cutting to cut AZ31 magnesium alloy plate with a square cross section. The plate size is 35mm long and the cross section size is 15mm×15mm, and the coordinates of the alloy are calibrated;

[0043] 2. The alloy is rolled for the first time by using a two-roll rolling mill, and the downforce is 1.5mm. The temperature of the roll is set at room temperature, and the temperature of the rolled bar is set at 450°C;

[0044] 3. The rolling direction of the previous pass is the axis, and after the sample is rotated 90° clockwise, the alloy is rolled for the second time, with the same amount of pressure, wherein the temperature of the roll is set at room temperature, and the temperature of the rolled bar is Set to 450°C;

[0045] The second step and the third step constitute a rolling cycle, and the number of completed rolling cycles is set to 20 passes, and the rolling process is completed.

[0046]Optical microscope observations show that there are still a large n...

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Abstract

The invention provides a magnesium alloy polyhedral circulation rolling method, so that magnesium alloy grains obtained by rolling are finer, smaller, higher in strength and higher in ductility, and the tissue refinement and mechanical property of the magnesium alloy are improved. The solution scheme adopted by the invention is as follows: performing primary rolling on a well cut magnesium alloy plate and then clockwise rotating the magnesium alloy plate for 90 degrees along a rolling shaft, performing secondary rolling on the alloy and forming a rolling circulation; or after performing primary rolling on the well cut magnesium alloy plate, performing multiple passes of rolling, clockwise rolling the plate for 90 degrees along the rolling shaft and then performing multiple passes of rolling. Compared with the prior art, the magnesium alloy polyhedral circulation rolling method has the following beneficial effects: under the pressure effects of different acting surfaces, crystal twin is excited to the greatest extent, crystal twin interface strengthening is introduced, the yield strength of the magnesium alloy is greatly improved, and the preparation method is simple.

Description

A technical field [0001] The invention discloses a method for preparing an ultrafine-grained metal material, relates to the field of forming technology, and in particular relates to a method for multi-face circulation rolling of an AZ31 magnesium alloy. Two background technology [0002] Magnesium alloy is the lightest metal structure material with high specific strength, specific stiffness, vibration damping, thermal conductivity, machinability and recyclability, so it is called "green engineering material" in the 21st century. Especially with the rapid development of the automobile industry and the electronics industry, a large number of magnesium alloy components have emerged as the times require, partially replacing plastics, aluminum alloys and even steel materials. It is expected that magnesium alloys will become one of the most important commercial lightweight metal structural materials in this century. one. But so far, the application scale of magnesium alloys is fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/00
Inventor 朱荣武艳军嵇文青蔡霄天刘玲丽
Owner NANJING UNIV OF SCI & TECH
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